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1. ### Please prove that the lost of KE is the largest when it undergoes perfectly inelastic collision (stick together after collision )?

...velocity between the two colliding objects after impact is zero. In other words, the two objects move with the same velocity Vc (say) after collision . Loss of kinetic energy E = initial kinetic energy (Ei) - final kinetic...

分類：科學及數學 > 物理學 2016年12月23日

2. ### Question about x-ray, concept confusion?

... few electrons are stopped by the target atoms in a single collision . The Bremsstrahlung spectrum is thus a "continuous spectrum...

分類：科學及數學 > 物理學 2016年11月05日

3. ### Explain why photoelectrons have different speed while their incident photons have fixed energy.?

... electron may need to undergo a number of collisions with the material atoms before it escapes from...material. The is the main reason for the variation in kinetic energy of the photo-electrons. I don...

分類：科學及數學 > 物理學 2016年11月05日

4. ### Why (3) is not correct?isn't infrared produced? Isn't black body radiation produced?

...electromagnetic radiation. The radiation so emitted is caused by collisions between molecules in the object, which possess thermal kinetic energy energy. By this means, the radiation...

分類：科學及數學 > 物理學 2016年11月05日

5. ### problem in momentum?

(a) Find the value of m2. m1*v1 = m1*v1' + m2*v2' m2 = m1(v1 - v1')/v2' = m1(v1 - v1')/(4v1/5) = 5m1(v1 - v1')/4v1 (b) Find the relation between v1' and v1. m2 = 5m1(v1/4v1 - v1'/4v1) m2/5m1 = 1/4 - v1'/4v1 v1'/4v1 = 1/4 - m2/5m1 v1'/v1 = 1/16 - m2/20m1 v1' = v1(1/16...

6. ### momentum and time

... is just the same as "impact time", which usually used in the case of collision . 2015-08-03 15:52:46 補充： Q:the force should be negatively related...

7. ### momentum

...original motion direction of the ball. 2015-07-04 00:43:07 補充： In 5b, the ball doesn't rebound (because of smooth.... It means there is NO collision at all, as there is NO transfer of momentum...

8. ### Momentum

1. Where is the diagram? 2. (a) Use momentum conservation 0.08 x 3 = (0.08 + m) x 1.6 where m is the mass of the rubber solve for m gives m = 0.07 kg (b) Force = 0.07 x 1.6/1 N = 0.112 N The force is frictional force. 3. (a) The final momentum...

9. ### 物理題，求算式，thank you!

... most simple approach is to find the speed of car A after collision using conservation of momentum. But in this case, if the two cars are of the same mass, car A should acquire...

10. ### Physics 溫習題目 5

... the force acts on the block F = 25 N 2. (a) Fall in height of the person = (30 - 2.75) m = 27.25 m Use equation: v^2 = u^2 + 2as...